Reconciling anomalously fast heating rate in ion tracks with low electron-phonon coupling

Abstract

Formation of swift heavy ion tracks requires extremely fast energy transfer between excited electrons and a lattice. However, electron-phonon energy exchange is too slow, as known from laser-irradiation experiments and calculations. We resolve this contradiction noticing that electron-phonon coupling is not the sole mechanism of energy exchange between electrons and ions: heating of electrons also alters potential energy surface of atoms, accelerating them and increasing their kinetic energy.

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• Non-ionizing cross section of electron scattering on atoms in matter accounting for dynamical screening effect
• Ultrafast X-ray induced damage and nonthermal melting in cadmium sulfide
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• Thermodynamic properties of CrMnFeCoNi high entropy alloy at elevated electronic temperatures
• Ultrafast X-ray interaction with photovoltaic materials: Thermal and nonthermal responses